420 (cannabis culture)
|Observed by||Cannabis counterculture, legal reformers, entheogenic spiritualists, and general users of cannabis|
|Significance||Day to smoke Cannabis around the time 4:20 p.m.|
420, 4:20, or 4/20 (pronounced four-twenty) is slang in cannabis culture for the consumption of cannabis, especially smoking cannabis around the time 4:20 p.m. (or 16:20 in 24-hour notation) and smoking cannabis in celebration on the date April 20 (which is 4/20 in U.S. form).
In 1971, five high school students – Steve Capper, Dave Reddix, Jeffrey Noel, Larry Schwartz, and Mark Gravich – in San Rafael, California, calling themselves the Waldos because "their chosen hang-out spot was a wall outside the school", used the term in connection with a 1971 plan to search for an abandoned cannabis crop that they had learned about, based on a treasure map made by the grower. The Waldos designated the Louis Pasteur statue on the grounds of San Rafael High School as their meeting place, and 4:20 p.m. as their meeting time. The Waldos referred to this plan with the phrase "4:20 Louis". After several failed attempts to find the crop, the group eventually shortened their phrase to simply "4:20", which ultimately evolved into a code-word that the teens used to mean consuming cannabis.
Mike Edison says that Steven Hager of High Times was responsible for taking the story about the Waldos to "mind-boggling, cult-like extremes" and "suppressing" all other stories about the origin of the term. Hager wrote "Stoner Smart or Stoner Stupid?", in which he attributed the early spread of the phrase to Grateful Dead followers – after Reddix became a roadie for the Dead's bassist, Phil Lesh – and called for 4:20 p.m. to be the socially accepted hour of the day to consume cannabis.
April 20 has become an international counterculture holiday, where people gather to celebrate and consume cannabis. Many such events have a political nature to them, advocating the liberalization / legalization of cannabis. Vivian McPeak, a founder of Seattle's Hempfest states that 4/20 is "half celebration and half call to action". Paul Birch calls it a global movement and suggests that one can't stop events like these.
As marijuana continues to be decriminalized and legalized around the world, Steve DeAngelo, cannabis activist and founder of California's Harborside Health Center, notes that "even if our activist work were complete, 420 morphs from a statement of conscience to a celebration of acceptance, a celebration of victory, a celebration of our amazing connection with this plant" and that he thinks that "it will always be worthy of celebration".
In North America
North American observances have been held at many locations, including:
- "Hippie Hill" in San Francisco's Golden Gate Park near the Haight-Ashbury district,
- The University of Colorado's Boulder campus,
- Ottawa, Ontario, at Parliament Hill and Major's Hill Park,
- Montreal, Quebec, at Mount Royal monument,
- Edmonton, Alberta, at the Alberta Legislature Building,
- Vancouver, British Columbia, at the Vancouver Art Gallery, but as of 2016 also at Sunset Beach.
- Washington Square Park in Manhattan, the largest and most notable of a number of gatherings and demonstrations on April 20 in New York City.
- Mile High 420 Festival in Denver's Civic Center Park
- The National Cannabis Festival in Washington D.C. has been running since 2016 and includes live music, educational sessions, and history, and local vendors.
- The University of California, Santa Cruz, where the growing size of the unofficial event there caused the Vice Chancellor of Student Affairs to send an e-mail to parents in 2009 stating: "The growth in scale of this activity has become a concern for both the university and surrounding community."
In Ljubljana, Slovenia, the University of Ljubljana's student organization has carried out several annual cannabis-themed protests that have successfully contributed to the debate on cannabis status in Slovenia and the subsequent legislation proposals in 2018 by gathering responses from various political parties in Slovenia and ranking them accordingly. 
Using 25 years of U.S. national data, one study found a 12% increase in the risk of fatal motor vehicle crash between 4:20 p.m. and midnight on April 20 compared to identical time intervals on control days. Among the subgroup of drivers less than 21 years of age, risks were 38% higher on April 20 than on control days.
Signs bearing the number 420 have been frequently stolen. In Colorado, the Colorado Department of Transportation replaced the Mile Marker 420 sign on I-70 east of Denver with one reading 419.99 in an attempt to stop the thievery. The Idaho Department of Transportation (ITD) replaced the Mile Marker 420 sign on U.S. Highway 95, just south of Coeur d'Alene, with Mile Marker 419.9. The Washington State Department of Transportation (WSDOT) implemented similar measures. In Goodhue County, Minnesota, officials have changed "420 St" street signs to "42x St".
In 2003, California Senate Bill 420 was introduced to regulate medical marijuana use, in deliberate reference to the status of 420 in marijuana culture. An unsuccessful 2010 bill to legalize cannabis in Guam was called Bill 420.
On January 9, 2019, H.R. 420 was introduced into the 116th Congress by Rep. Earl Blumenauer (D-Oregon), named the Regulate Marijuana Like Alcohol Act, which is designed to remove cannabis from the Controlled Substances Act and return regulation to the states. 
Dial-code of the Czech Republic
As the country dial-code of the Czech Republic is 420 and the rate of cannabis use there is one of the highest in the world, some foreign visitors think that cannabis is legal in this Central European country. However, those smoking cannabis outdoors will be fined and possessing more than 10 grams of marijuana is considered a crime. In 2016, Snoop Dogg displayed his knowledge of marijuana on the game show, The $100,000 Pyramid. Snoop replied without delay that the country code for the Czech Republic is 420. He would later use the number as one of the dollar amounts in the "Face the Devil" bonus round of his 2017 reboot of the classic American TV game show The Joker's Wild.
- "420" (Family Guy)
- Drug subculture
- Hash Bash, held annually the first Saturday in April since 1972 at the University of Michigan
- Legality of cannabis by country
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Mr. Hager said the significance of April 20 dates to a ritual begun in the early 1970s in which a group of Northern California teenagers smoked cannabis every day at 4:20 p.m. Word of the ritual spread and expanded to a yearly event in various places. Soon, cannabis aficionados were using "420" as a code for smoking and using it as a sign-off on flyers for concerts where the drug would be plentiful. In recent years, the April 20 events have become so widespread that several colleges have discouraged students from participating.
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- Media related to 420 (cannabis culture) at Wikimedia Commons